Hah! $360. They hope they've found a sucker. People who change the motor usually say how easy it was, and that they found a automotive window motor at a local automotive parts store when they brought their old step motor with them. Usually for under $50. Also people have found them at junk yards.
Personally, I just removed the step assembly (Kwikee 2-step unit), worked on it on the bench and found that after I cleaned everything up (just the electrical contacts) and greased the gears in the gear case there was nothing wrong with the motor.
Good luck to you though...